Motor-compressor unit



NW. 6, 1934. G. ANDRESEN MOTOR COMPRESSOR UNIT Original Filed Jan. 31, 1931 4 Sheets-Sheet l CW 2 Wm @w e a 5 m Nov 6, 1934. ANDRESEN 1,979,851

MOTOR COMPRESSOR UNIT Original Filed Jan. 51, 1931 4 Sheets-Sheet 2 J7 Z2 Q Z2 2 4 40 V i A 56 J72 W272 for":

fiearye flfidresen, fl m Nov. 6, 1934- G. ANDRESEN MOTOR COMPRESSOR UNIT 4 Sheets-Sheet 5 Original Filed Jan. 31, 1931 Nov, 6, 1934.. G. ANDRESEN MOTOR COMPRESSOR UNIT Original Filed Jan. 51, 1931 4 Sheets-Sheet 4 .[n #217 for. George fizdresen V 5/ ateway Ma,

3 v 35 line 4 on Fig. 2 and viewed in the-direction of the \shaft 16 a bushing 30 of thermal insulating mate- Patented Nov. 6, 1934 mbrbiilccmiiiisomm I 1 :1; 2 ided and this application Novem l r a ber 1 6, 193 1, Serial No. 575,425,. V v

' My invention relates mas sarcomas, to refrigeratinguapparatusnot the :type in which the compressor discharges "into atreceptacle in which a the sealing and/orluhricatingliquidis separated I 5 from the gaseousrefrigeranhthe present applicationbeinga divisionvof'my pending application for United Statest-Letters Patent Serial No. 512,671, filed January"3'1-, 1931. One oflmy, objects isto, provide for. the mini- 1o, mizing of'the transference of heat fromthe motor to the compressor and tothesealing'and/or lubricating liquid and connection therewith to produce and maintainyto as-perfect a degree 7 apart plate-like portions 20 and 21,'respectively,

united with the legs 19. The compressor is 70 aspossible, adiabatic compression. v .Another object is towprovide in a structure wherein the motor is'cooled :by contact with gaseous refrigerant discharged from the compressor, for the flowing in proximity to the motor of a suflicient volume 'of the gaseous refrigerant to g produce adequate cooling of the motor and other objects as will be manifest from the following description;

Referring'to the accompanying drawings: Figure 1' is a view, somewhat diagrammatic in nature,-'of a refrigerating apparatus embodying my invention. 1 1

Figure'2 is a view in' sectional elevation of the hermetically sealed compressor and motor unit of theapparatus. 1 ii r V Figure 3 is a view in sectional elevation through the center of the compressor,- the section-being :taken at the line 3 of Fig.5 and viewed in the direction of the arrow. 1 1 l I Figure Plan-sectional view'taken atlthe )armw, l v I Figure 5 is a plan sectionalxview taken at'the line 5 on Fig. 3' and viewedlin the direction of the arrow 1 l t:

is a seetionalview: taken atzthe line 6 on Fig; 4 and viewed in the-directionof the arrow; and '1: Figure -'7-, a sectionalview taken Eat: the line 7 on Fig. '6 and viewed, inzcthe direction ofthe arrow.,

' s'Referring to -the apparatusgasg disclosedgand constituting one embodiment {of my invention, it ccmprisesza' compressonlo which-may be or any desirable'construction;fonaexample, of the-intermeshing herring bone gear type as Shownand to which a sealingiandslubricating:liquidis sup- :fan-and compressor assembly is, located in a hermetically sealed container or housing x repre- .sented'atl36, the-,compressor discharging into the :housing 136-; from; which the compressed gasifled c110 plied, and a motor li-zshown-as of-the electrically drivenatype i andlocated above the 00 1 1 36 501 10 foredriving the flatten 1 a 15.5 :Lccatedrbetweenthe motor. thecomedges-of the paddles ,of the fanand represented with the .-wall of the opening 29.-

p ressor 10'is a fa n 12 of the paddletype the lower .endof theian being formed of a disk-like plate l3shown as extending to substantially theouter The'fan 12 which is. actuated by the motor 11 is connectedatits hub 15 with the lower end of the armature-shaft 16 of the motor, the drive of the compressor by the motor being through the fan, 13 by means of a shaft .17 connected with the o5 fan. a v

The parts described are supported on a frame 18 comprising legs 19 and upper and lower spaced bolted at 22 to the underside of the plate 20, through an opening 23 in which latter the shaft 17-passes,the top of the plate 20 being recessed around the shaft'as represented at 24. I

The plate 21 is provided on its upper surface at its marginal edge with anannular flange 25 from which rises a plurality of upwardly extending bosses 26 shown as four in number and equidistantly spaced apart about the flange 25, the motor llbeing supported at'itsfield-core 27 on these bosses and held in place by screws 28 extending downwardly through holes in the core and screwed into the flange 25 thereby supporting the motor upon surfaces of the frame of relatively small area to minimize the. transference by conduction from themotor through theframe 18 to the compressor and. sealing andj.-lubricating fluid; of heat generated bythegmotor. The shaft 16 extends downwardly through; an opening 29 in the plate 21 between the wall of-whichand the .90

rial-is interposed. The :bushing 30 is preferably hollowed out internally between "its: upper and tact withthe shaft 16, and the-wallof the opening 29 is likewise internally annularly recessed as represented at 32 and 33 also for the purpose of minimizingzthe area of contact of the bushing 30 :A'shroud member locatedabove the paddlesl i v and represented at 3.4 isprovided; for cooperation The compressor 10, shown intermeshing herring-bone gear type 'co'mmun'icates at its inlet 37 with a pipe 38 and at its out-g of initial intermesh. By the arrangement shown with pipes 40 which open into a pipe-41, the pipe operation of the compressor, is continuously fluid passes to a condenser forming a part of the refrigerating apparatus and hereinafter referred to, the lubricating and sealing liquid discharged from the compressor gravitating to the bottom of the housing 36 and after conditioning, as hereinafter described, being retumedto the inlet of the compresfsoii lets 39, located at opposite ends of thecornpressor 41 opening at its upper endintoa,passage 42 the plate portion 21 and're'gisterin'g withja' pf sage 43 in the bushing and communicating with the recess 31, this recess' also communicat ing with a passage 44 intheopposite-side ofthe bushing 30 and which communicates witha' pas-'- sage 45 diametrically opposed to the :passage 42;.

and opening at its outer end into a pipe 46 having a down turne'd endl47i terminating. directly above the recess 24,-:whereby:thefcoinpressed gaseous refrigerant'and'the lubricatingsand sealing liquid charging at a'point' above thev-recess 24-, the 'liquid discharging from the pipe'46 inaintaining 'a'body discharged'from the compressor 'traverses'wthe body the'coil in thet/receptaclefil extends wherei-by the sealing and lubricating liquid in this coil "is caused to beam heat-interchange relationship passages and pipes just described finallydisof lubricating liquid around theshaft 17 a'nd the i excess =1iquid'" overflowing =to the bottom of the housing; the compressed gaseous -refrigerant"rising in the housing 36.

{' The-condenser 'above' referred-toand into the 'gaseoustrefriger'ant compressed by: the cornpressor lois discharged, is represented fat 48- and is sh'o'wnasof the type comprising an upper-"header 49 incommunication at one end with-the top por- -tion of th'eh'ousing "36,.through the medium 'of'a pipe-"sopa-iower header"'51' forming aAreceptacIe v compressor','with theres'ultant high efliciency in and a series "of yertical-pipes 52'iop'eningIat their upper andlower en'ds, 'respectively, into/the r in my, "above referred to-pending application for "headers 49 =and--51-. The condenser 48 maytemploy any desirable 'cooling means therefor, the

condenser: being I showna-as aircooled; z'as for exain'plebya motor-'drivenfan Zindicatedat 53.

Itmay be-herestated'that in the-operationof the apparatus: the: refrigeranthliquefied in. the condenser. 48.- discharges into :i-thea receptacle 51 --wherein'itaccumulates and from which it passes -through a valve-controlled port as disclosed in said rpendingl application Serial-.No; 512,671

intoa pipe 55 and through-aavalve.devicea56hereinafterureferredr to. and" thence athrough a pipe 57 a into! the.v refriger'atingi element, or: evaporator, 58, .which may -be aofiany desirable construction that shown bein'gzof rai'common'jandawell known use. 1 The top of ithexrefrigerator element "58 is connected with thep'ipe 38 .for leading thegasified refrigerant from the refrigeratingelement back -to the-compressorlo. l The apparatus-shown incorporates means for conditioning the sealing liquid in -accordance 'with the invention-described in my pending applicationior United States Letters ::Patent :Ser. 3 No.-"381",862, file'dJuly 29;- 1929, for improvement iii refrigeration. The p'articular construction'of q erant-' fromrising in'the receptacle 51 to the pipe "64,these means'comprisi'ng the system of valves disclosed in United-lstates Letters Patent No.

these means illustrated herein is the same" as that shown in pending "application 1 Sen-No.

pipe o9 =and opposing and contact lubricating functionsh 91-2: l i

In the operation of 'Lthe" apparatus a body of end of the. coil 60 and the opposite end of which is connected with a pipe 62 which communicates withaport 63 in the casing of the comzipresfsor shown as located midway between the ends of the intermeshing gears of the comprssor and so positioned as to communicate with the space between the gears at their points the lubricating and sealing liquid during the qrawnirmm the body thereof in the bottom of the housing 36, thence passed through the coil 60*an'd the'coil' iii-tank 51 wherein it is subjected respectively to the cooling effect produced by the'fa'n- 53 and the temperature of the liquefied refrigerant and then introduced into the interior of the compressor for performing the sealing and liquefied refrigerant isvmaintained in the receptacle '51 ias i hereinafter described and inwhich with the liquefiedrefrigerant' in the receptacle -51,.-whereby the temperature .of the sealing and lubri'cating 'liquid,x'due tovits subjection to the temperature ofuthe condensed refrigerant, rises land falls substantiallysin step with the rise and :fall 'of'the. temperature ?of .the condensed refrigerant the temperatureof which latter rises and falls 'responsiveito theheat of the compressed gaseous refrigerantkdischarged from the compresson; regardlesssofayariations in the relative quantities of gas and 'oil i discharged from the the operationofethe apparatus as fully set forth patent.

In accordance with the. preferred illustrated r embodiment v oif my. invention,.- provision is made forcontinuously-circulating .-the gaseous :fiuid from the housing 36 to the condenser and from a the latter; back to the housing, for the purpose of: cooling the, motor and producing flow of the compressed refrigerant from the housing to the mcondenser;the,,apparatus to this end being provided with-a-pipe164which connects at one-end with the upper; endof'the liquefied refrigerant receptacle 51 and whichopens at its other end t into the housing36,preferably,through the shroud member 34 abovethe fan 12, the fan in operating producing suction in the pipe 64 with resultant rcirculation ofzthegaseous refrigerant. The fan 12 is of 'such capacity thatit will circulate gases in a quantity sufficient to insure the proper coolpressor.

It is desiredthat therewbe' maintained at all "times a passage throughwhich a portion of the compressed gaseous refrigerant discharged from th'e housing'36 isreturned to the latter to thus effect the continuous circulation above described.

In' the particular construction shown, means are provided -for preventing the liquefied refrig- "1,759,534" granted to me May'20, 1930, the lower valve devicewhich controls theport above referred to land through which the 7 liquid refrigerant is supplied from the receptacle 51 to the pipe 55 and operates'to open this port when the liquid refrigerant rises in the receptacle 51 above a predetermined level, being located in the receptacle 51, and the upper valve device and corresponding with the upper valve structure 23 of the patent referred to and serving to prevent substantial evaporation of the liquefied refrigerant while in the pipe 55, being represented at 56.

The valve structure 56 serves to maintain 1 throughout the range of the temperatures of the condensing medium a substantially low and uniform differential pressure at opposite sides of the lower valve device above referred to, resulting in the actuating of the discharge by a substantially constant-level of liquid refrigerant in the receptacle 51 which, as shown, is below the pipe 64.

In the construction shown, means are provided for leading portions of the sealing and lubricating liquid to the bearings for the rotating parts of the compressor, the means shown comprising a passage 69 communicating at one end with the port 63 and at its opposite end with a vertical passage 70 having a lateral branch '71 opening into the journal portion 72 provided in a disk 73 positioned in the compressor-casing and in which disk the stub shaft 74 of one of the gears is journalled. The lower end of the passage '70 connects with a lateral passage 75 which opens through a port 76 into the journal portion 7'7 of another disk 78 in the compressor casing for the other stub shaft '79 of this gear, the passage 75 opening through a port 80 into the journal portion 81 of another disk 82 in the compressor casing in which the stub shaft 83 carried by the gear to which the shaft 17 is connected, is journalled. Thus in the operation of the compressor temperature-conditioned lubricating liquid is supplied to the journal bearings for these several stub shafts, as well as to the journal bearing for the shaft 17 supplied with lubricating liquid by reason of the bath thereof maintained in the recess 24.

It will be understood from the foregoing that by providing means for effecting the flow of the compressed gaseous refrigerant from the receptacle (exemplified by the housing 36) into which the compressor discharges, into the condenser without the addition of heat and particularly by providing for the return of gaseous refrigerant from the condenser to the receptacle, stratification of the gases in the receptacle and which are non-condensible at the pressures produced by the apparatus, the effects of hydraulic friction and of counter-currents produced in the condenser, with resultant impedance to the flow of the gaseous fluid to the condenser, are minimized. Furthermore, the apparatus functions at a lower differential temperature between the receptacle and the condenser than in the ,case of structures wherein thermal means are provided for inducing the flow of the compressed refrigerant to the condenser, resulting in consequent low pressure in the receptacle and decreased impregnation of the sealing and/or lubricating fluid with the gaseous refrigerant.

In the arrangement shown wherein the motor is located in the receptacle into which the compressor discharges the induced flow of gaseous fluid in the housing not only serves to effect the result just described but also serves to cool the motor by the convection currents produced without the supply of additional heat to the receptacle or its contents and, when the condenser is provided with a return connection .to the housing as described, regardless of the volumetric displacement of the compressor.

Another feature of great advantage is that of reducing to the minimum the possibility of heat transference from the motor to the compressor and to the sealing and lubricating liquid, with a view to effecting substantially adiabatic compression which object is substantially accomplished in the arrangement shown and involving the sealing and lubricating liquid conditioning by subjection to the temperature controlling effect of the condensed refrigerant and the isolation of the motor from the compressor and the sealing and lubricating fluid from the compressor, so far as the matter of heat interchange is concerned.

While I have illustrated and described a particular construction embodying my invention, I do not wish to be understood as intending to limit it thereto as the same may be variously modified and altered without departing from the spirit of my invention.

What I claim as new, and desire to secure by Letters Patent, is: x

1. In refrigerating apparatus, the combination of a rotary compressor, a journalling portion for the shaft of the rotor of said compressor and above which said rotor-shaft extends, said portion containing a recess in its upper side at said rotor-shaft, a motor for actuating said compressor, a hollow journalling portion for the shaft of the rotor of said motor providing a space between the ends of said last-referred-to journalling portion and the side of said motor shaft, means opening into said space for conducting the discharge from the compressor into, and through, said second-referred-to journalling ,portion, means for causing the discharge from said compressor leaving said last-referred-to :jburnalling portion to pass to said recess for maintaining a body of sealing and/or lubricating liquid therein, and a receptacle in which the liquid overflowing said recess is collected, said recess being out of communication with said receptacle.

2. In refrigerating apparatus, the combination of a rotary compressor, a member in which the shaft of the rotor of said compressor is journaled 

